It's deffo an L8 I can tell that by the circuitry, Sue Collins runs Collins performance with her son Martin. Get a tuner to examine the map would be the easiest way, company's like MSD keep a S/N based record of all there chips so you could of just phoned them with the S/N and they would have been able to confirm but in other cases this is not possible.

Just because it starts up and runs does NOT mean it's the correct chip, the turbo housing is critical to the software, I.E a T34 with .48 housing and .55 would require different calibrations. You need to get that chip confirmed and get it to a tuner to get the fueling etc checked out.

Re the second check 353F I am pretty sure is the check sum algorithm used.

T34 is a hybrid uprated turbo which is what most stage 3 conversions consist so most likely you have (BT Escos has same turbo but with the largest exhaust housing (.63) T3 is standard turbo on these.


Martin